Need help with UV mapping with seams
Apply "Scale" in Object Mode first.

Try one seam from top to bottom. Probably in the back so it's not visible. And a second seam around the bottom outside edge and another around the top outside edge.



You can then export the UV Layout and bring it into an image editing program like Photoshop or Gimp and arrange your labels etc. Then save that (Less the UV map) and bring that into Blender as your texture.



If your UV map comes out like this (Vertical) you can rotate the UV Map 90' just like in the Editor. "R" + 90